package zhouyang;

import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

/**
 * 多线程之间按顺序调用，实现A->B->C
 * 三个线程启动，要求 AA打印5次，BB打印10次，CC打印15次
 * 接着继续AA打印5次，BB打印10次，CC打印15次
 * 循环10次
 */
class ShareData{
    private  int number = 1;//标识位，A：1，B：2，C：3
    private Lock lock = new ReentrantLock();
    private Condition c1 = lock.newCondition();
    private Condition c2 = lock.newCondition();
    private Condition c3 = lock.newCondition();
    public  void methodA(){
            lock.lock();
        try {
//            1.判断
            while (number!=1){
                c1.await();
            }
//            2.干活
            for (int i = 1; i <=5 ; i++) {
                System.out.println(Thread.currentThread().getName()+"\t"+i);
            }
            //3.通知
            number=2;
            c2.signal();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            lock.unlock();
        }
    }
    public  void methodB(){
            lock.lock();
        try {
//            1.判断
            while (number!=2){
                c2.await();
            }
//            2.干活
            for (int i = 1; i <=10 ; i++) {
                System.out.println(Thread.currentThread().getName()+"\t"+i);
            }
            //3.通知
            number=3;
            c3.signal();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            lock.unlock();
        }
    }
    public  void methodC(){
            lock.lock();
        try {
//            1.判断
            while (number!=3){
                c3.await();
            }
//            2.干活
            for (int i = 1; i <=15 ; i++) {
                System.out.println(Thread.currentThread().getName()+"\t"+i);
            }
            //3.通知
            number=1;
            c1.signal();
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            lock.unlock();
        }
    }
}
public class ConditionDemo {
    public static void main(String[] args) {
        ShareData shareData = new ShareData();
        new Thread(()->{
            for (int i = 0; i <10; i++) {
         shareData.methodA();
            }
        },"AA").start();
        new Thread(()->{
            for (int i = 0; i <10; i++) {
            shareData.methodB();
            }
        },"BB").start();
        new Thread(()->{
            for (int i = 0; i <10; i++) {
            shareData.methodC();
            }
        },"CC").start();
    }
}
